Linear fractional functions

Japanese: 一次分数関数 - いちじぶんすうかんすう
Linear fractional functions

…It is also called Möbius transformation. When the constants a , b , c , and d are complex numbers and ad - bc ≠ 0, the function is called a linear fractional function, and the mapping determined by this is called a linear fractional transformation. When c ≠ 0, it is defined on the complex plane C other than -d / c , and when c = 0, it is defined on the complex plane C.

*Some of the terminology explanations that mention "linear fractional functions" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…メービウス変換Möbius transformationともいう。定数a,b,c,dが複素数で,adbc≠0であるとき関数を一次分数関数といい,これより定まる写像を一次分数変換という。これはc≠0のとき-d/c以外の複素平面C上で定義され,c=0のときは複素平面C上で定義される。…

※「一次分数関数」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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